An upgrade of the original MK I MB845

The MB845i is an upgrade of our original design, the main change is the use of our LDT output transformers which make use of a tertiary or 3rd winding to reduce distortion and increase linearity.

Of the hundreds of valves that have been developed over the 90 years of audio history the RCA 845 remains King. Despite its huge size and big power dissipation it is relatively easy to drive. This fits very well with our philosophy of keeping amplifiers simple enabling the full sonic purity of valves to be revealed. Therefore our simple design is able to get 80 watts of triode magic out of only four valves. This way a powerful amplifier may be created that has both the speed and agility to handle large dynamics and bring out the inner detail of recordings that otherwise get lost in more complex amplifier designs. We believe it is the simple design and our unique LDT transformers that have made Icon Audio 845 amplifiers so popular with both audio fans and the hi fi press alike.

It is relatively easy to make an amplifier out of the huge range of component parts that are available today, but to create a sound which above all is truthful without sounding mechanical; all the components must be in sympathy with each other.

A special quality of the MB845s that hi fi reviewers have mentioned is ability of these amplifiers to sound consistently good with a wide range of speakers, making the MB845s easy to accommodate in your system.

Summary: At nearly half the weight and price of its bigger brother the MB845i makes a smaller, affordable alternative with similar performance with the same sonic signature.

Specifications and Features Comprehensive manual supplied Full instructions for DIY valve change included Meter supplied for valve 845 bias/condition testing All hand wired point to point No printed circuit board to ‘colour’ sound Class A, all Triode front end Fitted with the Shuguang 845, (upgrades available) 2x 845 precisely matched for best performance 6SL7 first stage gain valves 6SN7 driver valve, choke loaded plates 80w RMS output at clipping point Giving approx 15 Watts of Pure Class A Can be used with passive or active pre-amp 480mv (high) & 1000mv (low) input sensitivity. Signal to noise level -95db Hum and noise 0.5mv (low sensitivity)* Freq response -1db points= 7Hz - 18kHz +0, -1db Damping factor 14 @ 8Ω THD typically less than 0.4% @ 8w (1kHz) 4 & 8 ohm loudspeaker taps Custom hand-wound mains/output transformers using

Japanese special long grain iron and low oxygen copper Attractive valve cover included in the price High quality 2W metal film, & wire-wound resistors Blue LED mains indicator Polypropylene audio capacitors (optional copper foil) Silver PTFE audio cable Gold plated Input & speaker terminals 230/240/117volts 50/60Hz Power consumption: 180w quiescent, 290w max C E, ROHS, WEEE compliant where applicable Size 22cmW, 52W, 29H ( inc cover), 23kg each (Allow

space for connections and ventilation) Shipping H 32, W 32, D 59cm 24kg DID YOU KNOW: Two 845s in class AB1 produce as much “Class A” as a pair of KT66/300Bs in pure class A, but more than four times the power in AB1. And their low idle current causes much less stress on the tube. As it is less than 50% of the maximum rating, preserving tube life.

HI FI WORLD TEST